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I have a P30 Pro and Red SIMO plan. The 4G & WiFi Calling "extra" is enabled on my account, and WiFi calling works and is an option in my settings app.
There is no 4G Calling option, which I desire.
Any help/advice would be appreciated on if this works on open firmware Huawei devices. Customisation code C431 in particular.
(FWIW this feature does work on the latest open firmware Samsung devices).
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It might be worth calling 191 and Ask the agent to force the phone via sending an OTA configuration update that should provision your phone for Calling Over WiFi.
Current Phone > Samsung Note 20 5G - SM9860 Snapdragon.
Samsung One Ui 2.5 / Android 10.
Thank you. That is indeed true. Completely overlooked on my part. Great that it seamlessly works with no action required on the user's part.